[time-nuts] Microstepper

[Anders Wallin]

fwiw, looks like the spectradynamics patent expired today:
https://patents.google.com/patent/US6278330B1/en
afaik that design (more or less) is also described in
https://doi.org/10.1109/FREQ.1998.717932
a variation is also https://doi.org/10.1109/EFTF.2012.6502322 (which might
be sold by http://www.skk.it/index.htm - but that website is a bit
spartan..)
(if anyone knows more micro-stepper papers, please post!)

my plan is to present our DIY version of this, an open hardware design, at
EFTF2020.
we have two AD9912:s clocked at 1GHz (derived from the maser) producing two
LO's that drive a mixer-board that locks an OCXO that feeds a PICDIV.

Anders



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